Wild sheep accompanies us in ancient city (7)
I believe the answer is:
ephesus
'ancient city' is the definition.
(ancient Greek city)
'wild sheep accompanies us' is the wordplay.
'wild' indicates anagramming the letters.
'accompanies' means one lot of letters go next to another.
'sheep' with letters rearranged gives 'ephes'.
'ephes'+'us'='EPHESUS'
'in' acts as a link.
(Other definitions for ephesus that I've seen before include "City with temple of Artemis" , "Old Greek city in Turkey" , "Comedy of Errors setting" , "Ancient Greek port in Asia minor" , "Ancient city of Lydia" .)